I’ve been wanting to do a 7 blaser for years. I held off because of lack of brass options. Once lapua, Peterson or adg brass is available, I’ll start my prc.And I'm confident you'll, easily, be able to work up an accurate load in your confidently built semi custom Tikka 7PRC.
This size case are generally pretty forgiving and have a fairly wide sweet spot. I don't have a 7PRC but my 7 Blaser is kind of like a fraternal twin to the 7 PRC and it has probably been one of the easiest rifles I've ever owned to keep in tune.